TDA1576 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

TDA1576

FM/IF amplifier/demodulator circuit

Philips Electronics 

Philips Semiconductors

FM/IF amplifier/demodulator circuit

Product specification

TDA1576

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33 pF

3

4

TDA1576

560

pF

6

7

9

8

33 pF

(1)

39 pF

(1)

L1

1 kΩ

560

pF

L2

390 Ω

39 pF

MGE457

C8-9

VoAF

Adjustment of the demodulator circuit is obtained with an IF signal which is higher than the 3 dB limiting level; L2 should be short-circuited or detuned;

L1 should be adjusted to minimum d2 distortion, and then L2 to minimum d2 distortion.

(1) Coil data: L1 = L2 = 0.38 µH; Qo = 70; coil former KAN (C).

Fig.11 An example of the TDA1576 when using a demodulator with two tuned circuits.

handbook, full pagewidth

0.3

THD

(%)

0.2

MGE467

0.1

−75

−50

−25

0

+25

+50

+75

(fo = 10.7 MHz)

∆f (kHz)

Fig.12 Total harmonic distortion as a function of detuning; fm = 400 Hz; C8−9 = 6.8 nF; ∆f = ±75 kHz; Vo = 330 mV

for a frequency deviation ∆f = ±75 kHz.

1998 Nov 18

11

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